Spring-toothed harrow.



J. J. KOVAR.

SPRING TOOTHED HA R ROW. APPLICATION FILED JULY 16.1915.

1,266,489. Patented May14, 1918.

2&9. a

ig/M UNFFED STATES PATENT @FFlQE.

JQSEPI'I J KOYA R, OF DODGE CENTER, 'MINNESQTA.

SPRING-TOOTHED HARROW.

. Application; file dJuly 1,6, 191 5.

Toiall to hom it may concern Be it, knownthat ,I, Josmur J .-;KOV,AR, a citizen of the United States, residing, at Dodge, Center, in the county of .Dodge .and State of ,-Minnesota, have invented certain new. and useful; .Improvements .in ,Spring- Toothed @Harrws;.;and1 do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable othersskilleddn,the. art towwhich it appertains tomake and use the. same.

h/Iy present invention relates to improvements .in ,sprin rtootheds harrows and. is in the nature-of angimprovement on my,copending applicationa filed January, 23rd, 1914:, under.Serial Number 813,87 2,-entitled Springi-toothed-harrow.

1, To, the above end, generally stated, the invention consists of the novel devices and combinations l. of. devices hereinafter described and defined, in, the claim.

. In. ,the accompanying. drawings, which illustrate the invention,like,characters indicate like parts throughout the several views.

Referring to the drawings:

Figure 1 is a fragmentary plan viewof; the improved harrow;

Fig. 2 is a view principally inside elevation with some parts sectioned on the irregu- 1am lin at ton Fig: 1;

Fig. 3 is a view in rear elevation and partly in transverse vertical section taken on the irregular line 21 m on Fig. 1.

Fig. 1 is a detail view with some parts sectioned on the line 00 m on Fig. 1;

Fig. 5 is a fragmentary detail view of one of the harrow teeth on an enlarged scale; and

Fig. 6 is a detail view in section taken on the line w a on Fig. 5.

Each section or unit of the improved harrow comprises a pair of laterally spaced forwardly and rearwardly extended drag bars 1, a. plurality of tubular rock shafts 2, flexibly connected to the drag bars 1, and a plurality of spring harrow teeth 3 mounted on each of the said rock shafts. In the drawings, only the rear end portion of one of the drag bars 1, the connected end portion of the rear rock shaft 2 and one of the barrow teeth, are illustrated.

As hown and described in my above identified application, the forward ends of the drag bars 1 of each section or unit are flexibly connected, one to the other, and in turn, to a common equalizing beam, and the rock Specification of Letters-Patent.

Patented May-1d, 1918.

Serial No. 40,227.

shafts .2 areconnectedby a link and 0scillated by a handlever to set the same indifferent positions for simultaneously mOYillg the-barrow teeth to andflfrom operativepositions,.-and to vary the depth they areto enter the ground.

One of the flangesof the-drag ,bar. 1 is turned. horizontally inward, and the other flange thereof, projects vertically upw ard. A bracket llOrests on the horizontal flange of the drag; bar 1 and is bolted to; the inner face of the vertical flangethereof. Inthe upper lportioniof the-bracketlO is formed a relatively ;large-bearing,-eye 11, through which the shaft 2 is loosely telescoped. 1 'llhe rock shaft 2 is held, bya saddle plate 12, against endwise movement in thelbearing eye 11, but withfreedom for rotary movement and to assume different vertical and horizontal angular positions inrespectito the drag .bar 1.

fThB saddle plate l2lis segmentalin cross section, rests directly on, the rock shaft and is rigidly and. detachably.securedthereto by a .nut-equipped :bolt 13. This ,bolt 13-. .is passed through axially alined holes in the saddle plat-e112 .and rock shaft 2, and. is held a gainst rotation, by forming the; hole in the saddle plate square to receive the equared upper 6110. portion oftsaid bolt. Inward of tlieibolt 13, the saddle plate 12 is extended through the bearing eye 11 and has integrally formed therewith a pair of laterally spaced upwardly extended flanges 14:. At the longitudinal center of the saddle plate 12, these flanges 14: closely embrace the bracket 10, upward from its eye 11, to prevent endwise movement of the rock shaft 2 in said bearing eye 11. From the longitudin-a1 center of the saddle plate 12, these flanges 1e diverge is opposite directions to permit both vertical and horizontal angular movements of the rock shafts 2 with respect to the drag bar 1.

In assembling the above described parts, the saddle plate 12 is first interlocked with the bracket 10, as best shown in Fig. 3, next the rock shaft 2 is telescoped through the bearing eye 11, under the saddle plate 12, and finally, the bolt 13 is passed through the alined holes in the saddle plate 12 and rock shaft 2, to hold the assembled parts in position.

The harrow tooth 3 is of curved and approximately involute form and is constructed from a Hat spring steel bar, upset to form highly important.

a sharp substantially diamond point at the free end of the tooth, for engagement with the ground. The other end of the tooth 3 is bent to form a seat 15 in which the rock shaft 2 is seated. This seat 15 has the same curvature as the rock shaft 2 and engages the same throughout substantially one half its circumferential surface.

The tooth 3 is rigidly secured to the rock shaft 2 with freedom for a limited circumferential adjustment thereon, by a nutequipped bolt 16 passed through alined perforations in the rock shaft 2 and through a longitudinally extended slot 17, formed in the seat 15 of said tooth. The curvature of the tooth 3, at its free end portion, is comparatively fiat and the under face of its point is flat, and the upper face thereof is convex. From the above description, it is evident that in the operative position of the tooth 3, the point thereof is approximately horizontally exposed and is arranged to move endwise, horizontally through the ground.

The shape of the point of the tooth 3 and the operative position in which it is held is As the point of the tooth 3 is passed through the ground, the earth moves thereover, rearward, and at the same time, laterally, in opposite directions from the longitudinal center of the tooth, as indicated by arrows marked thereon in Fig. 5. The movement of the earth over the harrow tooth, produces the very best scouring action thereon and it also carries vegetable matter, sticks, etc., away from the upwardly and forwardly curved body of the tooth and prevents the same from clogging thereon.

In the operative position of the harrow tooth 3, the point thereon is substantially vertically below the rock shaft Zand projects slightly upward. Under the pulling strain on the harrow, the curvature of the tooth 3 will be slightly flattened, thereby causing the free end of the tooth to assume a position slightly backward of its normal position so that it moves horizontally through the ground. However, the point of the tooth 3 may be set in slightly different adjustments longitudinally ofthe harrow by loosening the bolt 16 and giving the tooth 3 a slight rotary movement on the rock shaft 2.-

What I claim is:

A harrow having a curved tooth formed from a single piece of metal with a substantially diamond-shape point projecting forwardly and normally slightly upward, said tooth slightly straightening under pulling strains to thereby cause its point to assume an approximately horizontal position and move endwise through the ground, the lower face of the point being fiat throughout its entire width and the upper face thereof being convex with its greatest thickness at the longitudinal center of tooth.

In testimony whereof I aflix my signature in presence of two witnesses.

JOSEPH J. KOVAR.

Witnesses: EVA E. K6NIG,

HARRY D. KmeoRE. I

Copies of this patent may be obtained for five cents each, by addressing the. Commissioner of Patents, Washington, D. 0. 

